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Compared with typical gold nanoparticle(AuNP)synthesis routes which rely on aqueous reducing agents,reduction by carbon monoxide(CO)has various advantages such as no reducing agent left in the product,easier control of experimental conditions(at room temperature)and shorter residence times(less than 2 min).To our knowledge,CO reduction in AuNP synthesis has previously only been studied in a batch system.1 As this reaction employs two phases,a multiphase microreactor with a larger surface to volume ratio is expected to provide enhanced mass transfer between gas and liquid.Additionally,better control of the mixing can be achieved in a microfluidic segmented flow system which is expected to result in more monodispersed AuNPs.